The
Calendar
hole will go live in approximately
6 days
. Why not try and solve it ahead of time?
Recent Solutions
Achievements
Cheevos
Golfers
Solutions
All Holes
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Apéry’s Constant
Binary Lambda Calculus
Calendar
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Multitap Input
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
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><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
Erlang
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
Experimental Language
05AB1E
ALGOL 68
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Hole
All
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Experimental Hole
Apéry’s Constant
Binary Lambda Calculus
Calendar
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Multitap Input
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Bytes
Time
Submitted
Tower of Hanoi
FortuiteMan
🥈
120
13ms
9 hours ago
Day of Week
FortuiteMan
331
17ms
11 hours ago
Fractions
FortuiteMan
💎
66
6ms
12 hours ago
Tower of Hanoi
JOrE20
9,990
8ms
4 days ago
Prime Numbers
JOrE20
168
5ms
4 days ago
π
JOrE20
917
5ms
4 days ago
Niven Numbers
JOrE20
212
4ms
4 days ago
Leap Years
JOrE20
606
16ms
4 days ago
Kolakoski Constant
JOrE20
916
4ms
4 days ago
Hilbert Curve
JOrE20
15,241
9ms
4 days ago
Fibonacci
JOrE20
229
4ms
4 days ago
Evil Numbers
JOrE20
167
4ms
4 days ago
γ
JOrE20
917
5ms
4 days ago
Emojify
JOrE20
862
8ms
4 days ago
Divisors
JOrE20
690
73ms
4 days ago
λ
JOrE20
922
5ms
4 days ago
Arithmetic Numbers
JOrE20
52,779
22ms
4 days ago
99 Bottles of Beer
JOrE20
2,083
27ms
4 days ago
Abundant Numbers
JOrE20
802
274ms
4 days ago
Farey Sequence
FortuiteMan
🥈
98
12ms
6 days ago
Tutorial
FortuiteMan
88
5ms
11 days ago
Quine
CornerMercury
🥉
259
5ms
16 days ago
12 Days of Christmas
snoozingnewt
5,417
6ms
18 days ago
Niven Numbers
snoozingnewt
215
4ms
18 days ago
Emirp Numbers
snoozingnewt
247
4ms
18 days ago
Happy Numbers
snoozingnewt
218
4ms
18 days ago
Pernicious Numbers
snoozingnewt
238
4ms
18 days ago
Prime Numbers (Long)
snoozingnewt
526
1,423ms
18 days ago
Prime Numbers
snoozingnewt
503
18ms
18 days ago
Fibonacci
snoozingnewt
229
4ms
18 days ago
Emojify
snoozingnewt
862
8ms
18 days ago
Divisors
snoozingnewt
690
63ms
18 days ago
99 Bottles of Beer
snoozingnewt
2,083
23ms
18 days ago
Happy Numbers
FortuiteMan
173
41ms
19 days ago
Happy Numbers (Long)
FortuiteMan
🥉
173
181ms
19 days ago
Tower of Hanoi
Jacob385
10,921
7ms
20 days ago
Roman to Arabic
FortuiteMan
🥈
148
121ms
20 days ago
Fizz Buzz
JOrE20
91
5ms
20 days ago
Quine
FortuiteMan
261
5ms
21 days ago
Foo Fizz Buzz Bar
FortuiteMan
🥉
265
15ms
21 days ago
Tower of Hanoi
KatieLG
12,871
10ms
24 days ago
Lucky Tickets
FortuiteMan
🥈
166
41ms
24 days ago
Scrambled Sort
MeWhenI
🦄
470
130ms
24 days ago
Tutorial
TheZwierzLF
289
6ms
25 days ago
Tower of Hanoi
CaedenHarper
🥉
494
22ms
25 days ago
Tower of Hanoi
dokutan
9,032
9ms
26 days ago
γ
MeWhenI
💎
127
229ms
27 days ago
γ
FortuiteMan
🥈
497
37ms
26 Nov 2025
Topological Sort
MeWhenI
💎
332
132ms
25 Nov 2025
Fibonacci
FortuiteMan
27
4ms
24 Nov 2025
Minesweeper
MeWhenI
💎
251
709ms
24 Nov 2025
𝑒
MeWhenI
💎
56
6ms
23 Nov 2025
√2
MeWhenI
💎
83
2,976ms
23 Nov 2025
Tower of Hanoi
MeWhenI
💎
76
11ms
23 Nov 2025
99 Bottles of Beer
FortuiteMan
🥉
706
15ms
22 Nov 2025
Christmas Trees
FortuiteMan
🥈
109
5ms
22 Nov 2025
Card Number Validation
FortuiteMan
🥈
272
38ms
22 Nov 2025
Tutorial
JOrE20
63
7ms
18 Nov 2025
Set
MeWhenI
💎
828
2,618ms
18 Nov 2025
24 Game
FortuiteMan
🥈
1,690
22ms
16 Nov 2025
brainfuck
FortuiteMan
🥉
919
235ms
16 Nov 2025
Quine
JOrE20
🥉
259
5ms
13 Nov 2025
√2
FortuiteMan
🥈
85
220ms
12 Nov 2025
𝑒
FortuiteMan
🥈
62
8ms
12 Nov 2025
Prime Numbers (Long)
FortuiteMan
🥈
50
199ms
12 Nov 2025
Prime Numbers
FortuiteMan
🥉
48
4ms
12 Nov 2025
Minesweeper
CaedenHarper
🥈
4,437
1,563ms
11 Nov 2025
Fractions
CaedenHarper
654
12ms
11 Nov 2025
Zeckendorf Representation
CaedenHarper
🥈
724
144ms
11 Nov 2025
Foo Fizz Buzz Bar
CaedenHarper
802
39ms
11 Nov 2025
Ordinal Numbers
CaedenHarper
680
39ms
11 Nov 2025
Arrows
CaedenHarper
12,146
27ms
11 Nov 2025
Prime Numbers (Long)
CaedenHarper
287
168ms
11 Nov 2025
Prime Numbers
CaedenHarper
285
5ms
11 Nov 2025
Hexdump
CaedenHarper
26,165
855ms
10 Nov 2025
ROT13
CaedenHarper
🥉
628
119ms
10 Nov 2025
Fibonacci
CaedenHarper
229
4ms
10 Nov 2025
Emojify
CaedenHarper
862
8ms
10 Nov 2025
Divisors
CaedenHarper
690
64ms
10 Nov 2025
99 Bottles of Beer
CaedenHarper
2,083
22ms
10 Nov 2025